Slip rotation for rock drills



Dec. 1, 1931. G. c. PEARSON 1,834,727

SLIP ROTATION FOR ROCK DRILLS Filed July 51, 1928 5 Sheets-Sheet l Gus70v C HFRSON gwueniov k Dec. 1, 1931. G. c. PEARSON SLIP ROTATION FORROCK DRILLS Filed July 31, 1928 5 Sheets-Sheet 2 Dec. 1, 1931. G. c.PEARSON.

SLIP ROTATION FOR ROCK DRILLS Filed July 31, 1928 '5 Sheets-Sheet 3Zlwwntoz Gus rev CI PEHEJON abtomq Dec. 1, 1931 G. C. PEARSON SLIPROTATION FOR ROCK DRILLS 5 Sheets-Sheet 4 Filed July 31, 1928 gmnntocGus 777V C IZDEHRSON Dec. 1, 1931. c. PEARSON SLIP. ROTATION FOR ROCKDRILLS Fil'ed July 51 1928 5 Sheets-Sheet 5 gwue-ntob Gus rev C FZSHRSONPatented Dec. 1, 1931 UNITED STATES PATENT OFFICE T GUSTAV G. PEARSON,OF DENVER, COLORADO, ASSIGNOR TO GARDNER-DENVER; COMPANY, OF DENVER,COLORADO, A CORPORATION OF DELAWARE SLIP ROTATION non ROCK nnrnnsapplication filed July e1, 1928. Serial No. 296,599.

The object of the present invention is the provision of a simple, noveland effective means for holding the ratcheting mechanism that eliectsthe rotation of the piston and drill steel of a drilling machine active,and yet will permit its becoming inactive in emergencies aswlien a steelbecomes lodged so that it will not rotate readily.

A further and important object is to pro- 19 vide means for efiectivelysecuring the ratchet mechanism to permitthe tool and steel being turnedby hand.

In the accompanying drawings:

Figure 1 is a longitudinal sectional view the novel mechanism.

Figure .2 is a cross sectional view on the line 2-2' of Figure 1. I

Figure 3 is a detail view in elevation of the controlling handle andindicating its po sition with respect to the usual drill handle. Figures4 and 5 are cross sectional views on the lines 4-4 and 55 of Figure 3,when mounted on the tool. Y Figure 6 is a detail view in elevation ofthe controlling handle.

Figure 7 is a view in elevation of the journal portion or said handle.

Figure 8 is a longitudinal sectional view of a modified form ofconstruction.

Figure 9 is a cross sectional view of the same on the line 9-9 of Figure8.

Figure 10 is a detail "view'of the journal M portion ofthe handle ofFigures 8 and 9.

Figure 11 is a sectional view taken on the line 1111 of Figure 10. 1

Figure 12 is a detail side elevation of the mounting for the parts. 1

Figure 13 is a detail side elevation of portions of the handle,indicating their association and the manner in which they are normallyused.

Figure 14 is a plan view of the structure when used as illustrated inFigure 13.

Figure 15 is a View similar to- Figure 14 but illustrating the manner inwhich a tighter grip is secured on the ratchet ring.

Figure '16 is a similar view illustrating the manner in which theratchet ring is released by the operator.

through a portion of a tool equipped with The outer end of the otherplunger 32 proknown type that is capable of rotation for the purpose ofefi'ecting the rotation of the drill steel. This piston'has in its rearend-a nut that has a slidable interfitting engage ment with a rifle bar21 extending rearward ly through the bushing 18 and car a ing at itsrear end a ratchet head 22 locate in the housing 15. This ratchet headis provided with pawls 23 pressed outwardly by spring plungers 24. Thepawls are adapted to coact with the internal teeth 25 of a ratchet ringv26 surroundingthe head 22 and thereforealso located in the housing 15within the flange 16.

The ratchet ring 26. is rotatable, but is 7-5 normally held againstrotation by a clutch ring. This clutch ring preferably consists V of acontractile band 27 carrying a lining 28 that frictionally engages theperiphery of the ratchet ring 26. i

The housing 15 is provided with a "tangential bore 29, thatintersects-the chamber containing the above described ratchet mechanism,and this bore opens into a journal-box 30 formed on said housing at oneend of the es bore and disposed longitudinally of thecylinder member. Inthe bore 29 are oppositely disposed slidable plungers 31'and'3'2"-having notches 33in their inner ends. The ends of the band 27 areformed'into hooks 34 engaged 00 in said notches. I Tlieplunger 31 hasits out- .er end borne against by an adjusting plug 35 threaded into oneend of the bore and held against accidental turning by a cross pin 26.

jects into the bore of thebearing box 30.

The usual handle by which the tool is held and can be rotated isindicated at 37. It is U-shape'd in formation and is suitably secured tothe tool. Alongside this handle 37 there is located a controlling handle38 having a handle grip 39 disposed alongside the handle grip 40 of thetool 37. This grip 39 is also provided with an offset arm 41 terminatingin a thumb-piece 42. The controlling handle 38has a cylindrical bearingportion handle 37,. a v v In the modified form of construction, the

43 journaled in the bearing box 30. This journal portion 43 is cut awayto provide a shoulder 44 which as shown in Figure 4 constitutesacam'that bears against theouter end of the plunger Obviously thereforeif the handle 38 is swung toward the handle 37 the cam 44 will act toforce the plunger 32 inwardly, thereby contracting the clutch ring uponthe ratchet ring. Projecting outwardly from the box 30 and out of linewith the bore 29 is a tubularportion 45 in which is arspringpressedplunger-46 that bears against another cam portion 47 formed by cuttingaway the journal portion 43 of thehandle 38 (see Figure 5). v This camportion 47 is in opposition to the cam portion 44 and consequently theplunger 46 operates in a direction to urge the plunger 32 inwardly. Y

v .The plunger 46 is borne against by a coiled spring ,48 thatv is inturn borne against by an adjustable plug 49 threaded into the outer endof the tubular portion 45 and normally held against} accidental rotationby a cross pin50. By adjusting the plug 49, the tension .oftliespringi48can be altered.

' \Vith this construction, the operator of the tool can control therotation of the clutch ,ring=26, that .is tosay, he can put su-fficientpressure upon the plunger 32 to hold the ring 26 against rotation duringthe normal operation of the drill, If,however, the steel be- .comesstuck so that it will not readily rotate then the ring 26 will rotateinstead and if the handle should fly from his hand, the action will besuch that .the frictional engagement between the clutch ring 28 andratchet ring26 will be lessened and the rotation of ,the body. of thetool will not continue. Should it become necessary or desirable to clampthe ratchet ring more tightly inorder to turn'the toolbj' hand, then thehandle 38 is drawn down'closer to the main operating principaldifference is in the relation of the spring pressed a. plunger whichoperates on the controlling handle and .therefore the ;other parts have'be en given the'same reference numerals. It will benoted by refer-.enceto Figure 9 that the tubular portion in this structure and which isdesignated 45a ismade parallel to .the bore 29, but is located at oneside of the same, It contains a plung' 46a. that operates against a camportion 47a formed on the journal portion 43a of the toolandioperating'in opposition to the cam portion 4405 against which theplunger 32 bears, This relation of parts is not only more compact, butithas been foundto lessen the vibration that may occur in the operationof these parts. The thumb piece 41a/42a also extends from the shank ofthe handle 38 instead of from the grip or finger piece 39 and thus givesbetter space for the manipulation of the lingers. Thus, as illustratedin Figures 13 and 14 under ordinary conditions, the operator simplygrasps the terminal grip 40a of the handle 40, the supplemental handlebeing free. Under such circumstances, the spring 48 is operating to holdthe clutch ring 2728 in sufficient frictional engagement with theratchet ring 26 to maintain the latter against rotation. If the operatorwishes to place a greater frictional tension on the clutch ring, heslides his fingers over the finger piece 39 and draws it closer to thehand grip. On the other hand if he wishes to release the ratchet ring 26to permit it to turn, then he presses against the thumb piece 42a asindicated in Figure 15, thereby compressing the spring 48 and permittingthe clutch ring 2728 to expand.

A still further feature of advantage in this structure is the adjustmentthat can be obtained by manipulating the two plugs 35 and 49. Thisadjustment places the supplemental handle 39 at any desired distanceaway from the main handle 40. For exam- .ple, if it is desired toadjustthe handle 39 toward the handle 40, the operator withdraws the plug 35and screws inwardly the plug 49. This relieves pressure upon one side ofthe handle trunnion and applies pressure upon the other. When it isdesired to move the handle 39 away from the handle 40, the operation isreversed.

From the foregoing, it is thought that the construction, operation andmany advantages of the hereinvdescribed invention will be apparent tothose skilled in the art without further description, andit will beunderstood that various changes in the size, shape, proportion and minordetails of construction, may be resorted to without departing from thespirit or sacrificing any of the advantages of the invention. I a v WhatI claim, is:

1'. The combination with acylinder member and a reciprocatory pistontherein capable of rotation, of-means for effecting the rotation of thepiston including a rotatable ratchet ring, a contractile clutch ringthat surrounds the ring'and frictionally engages the same, a handlelever fulcrumed on the cylinder member and having means engaged with oneend of the clutch ring for contracting it, and an anchor plungera-djus'tably mounted in the cylinder member and on gaged with the otherend of the clutch ring.

2. The combination with a cylinder memher having a chamber and atransverse bore, of a reciproeatory piston in the cylinder member andcapable of rotation, means for effecting the rotation of the pistonincluding a ratchet ring, a contractile clutch ring surrounding theratchet ring and frictionally engaging the same, an anchor plungerslidable in the bore and engaged with one end of the clutch ring, anadjusting screw threaded in the bore and bearing against the plunger, asecond plunger slidably mounted in the bore and engaged with the clutchring, and means for moving the second plunger inwardly.

3. The combination with a cylinder member having a chamber and atransverse bore, of a reciprocatory piston in the cylinder member andcapable of rotation, means for effecting the rotation of the pistonincluding a ratchet ring, a contractile clutch ring surrounding theratchet ring and frictionally engaging the same, an anchor plungerslidable in the bore and engaged with one end of the clutch ring, anadjusting screw threaded in the bore and bearing against the plunger, asecond plunger slidably mounted in the bore and engaged with the clutchring, and a handle fulcrumed on the cylinder member and having a bearingagainst the second plunger to move it inwardly.

4. The combination with a cylinder member and a reciprocatory pistontherein capable of rotation, of means for effecting the rotation. of thepiston including a rotatable ratchet ring, a contractile clutch ringthat surrounds the ring and frictionally engages the same, a plungerslidably mounted in the cylinder member and operating to contract theclutch ring, and a handle for moving the plunger inwardly.

5. The combination with a cylinder mem her and a reciprocatory pistontherein capable of rotation, of means for effecting the rotation of thep-istonincluding a rotatable ratchet ring, a contractile clutch ringthat surrounds the ring and frictionally engages the same, a plungerslidably mounted in the cylinder member and movable to contract theclutch ring, and a handle fulcrumed on the cylinder member and having aportion adj acent the fulcrum bearing against the plunger to move itinwardly.

6. The combination with a cylinder member and a reciprocatory pistontherein capable of rotation, of means for effecting the rotation of thepiston including a rotatable ratchet ring, a contractile clutch ringthat surrounds the ring and frictionally engages the same, a plungerslidably mounted in the cylinder member and operating to contract theclutch ring, a handle fulcrumed on the cylinder member and having aportion adjacent the fulcrum bearing against the plunger to move itinwardly, and a spring also acting on the plunger to move it inwardly.

7. The combination with a cylinder member and a reciprocatory pistontherein capable of rotation, of means for effecting the rotation of thepiston including a rotatable ratchet ring, a contractile clutch ringthatsurrounds the ring and frictionally engages the same, a plunger slldablymounted in the cylindermember and operating to contract the clutch ring,a handle fulcrumed on the cylinder member and having a portion adj acentthe fulcrum bearing against the plunger to move it inwardly, and aspring having a bearing against the handle and acting therethrough onthe plunger to move it inwardly.

8. The combination with a cylinder memberand a reciprocatory pistontherein capable of rotation, of means for eifecting the rota-' tion ofthe piston including a rotatable ratchet ring, a contractile clutch ringthat surrounds the ratchet ring and frictionally engages the same, a.plunger slidably mounted in the cylinder member and movable to contractthe clutch ring, and a handle having a shaft portion journaled in thecylinder member, said shaft portion having a cam .a

portion bearing against the plunger to move it.

9. The combination with a cylinder mem ber and a reciprocatory pistontherein capable of rotation, of means for eflfecting the rotaof rotarymovement, of means for efiecting' such rotary movement including a riflebar having a ratchet head, 7 a ratchet ring surrounding the head, acontractile clutch ring surrounding the ratchet ring, a plunger thatengages the clutch ring, and a manually actuated handle fulcrumed on thecylinder member and having a bearing against the plunger to urge itinwardly and contract the ring. I

11. The combination with a cylinder member having a chamber, atransverse bore that intersects the chamber, and a bearing box intowhich the bore opens, of a reciprocatory piston in the cylinder memberand capable of rotation, a rifle bar with which the piston is slidablyinterfitted, said rifle bar having a ratchet head in the chamber, aratchet ring 7 surrounding the head, a contractile clutch ringsurounding the ratchet ring, plungers in the bores engaged with the endsof the clutch ring, a threaded plug bearing against one of the plungers,a handle ournaled in the bearing box and having a cam portion operatingagainst the other plunger, and a spring bearing against the handle tocause it to urge the plunger in a direction to contract the clutch ring.

12; The combination with a cylinder memher and arecipro'catory pistontherein capable of rotation, of means for effecting the rotation of thepiston including a ratchet ring,

aclutch for holding the ratchet ring against rotation, a main holdinghandle, a supplemental movable handle associatedwith the main handle andconnected to the clutch for operating it, and means for adjusting the msupplemental handle to place it in normal position at differentdistances from the main handle.

13. The combination With a cylinder member and a reciprocatory pistontherein capable 15 of rotation, of means for efii'ecting the rotation ofthe piston including a ratchet ring, a clutch ring for holding theratchet ring against rotation, a main holding handle, a supplementalmovable handle associated With the main han- 20 dle and connected to theclutch ring for con tracting it, means for adjusting theclutch ring andthereby the handle, a spring that operates against the handle, and anadjustable bearing for said spring.

535 In testimony whereof, I afi'ix my signature.

- GUSTA o. PEARSON.

